Apple Remote Desktop Dashboard Widget v3.6
The Apple Remote Desktop Dashboard widget* gives you an instant, at-a-glance view of the remote computers in your network.
It’s fully integrated with the Apple Remote Desktop administrative application, so a click on a particular computer will allow you to select and start working with any computer in the system.
* Requires a licensed copy of Apple Remote Desktop to be installed on your Mac.
Read more http://support.apple.com/kb/DL1568